Safety attachment for locomotives



June 18, 1929.

P. B. KAMEDlsH SAFETY ATTACHMENT FOR LOCOMO'IIVES Filed Oct. 20, 1923 i Ille f4 H0' fz f5 f7 v -l f5 Ilm/enfer I .'P. Kameahsh gay y f v atentedjune 18, 1929. l i y l l UNITED STATES P.Ii'rflszN'lg oFFilcr; I y

:PETER BENJAMIN KAMEnrsH, or WINNIPEG, MANIToBA,`cANADA.

SAFETY ATTACHMENT FOR LOCOMOTIVES.

Application filed October ,20, 1923. 'Serial No. 669,820.

in conjunction with a locomotive drifting at tachment are fully shown and describedinmy 60 tachment of the character set forth in my co prior application I have not considered it pending application, Number 521,418, filed on necessary to herein enter into ay detailed de-y the 10th day of December,-l92l.` scription or yshowing of thesame, but will just The principal purpose of the present invenrefer to those parts with which my safety de-r tion is to provide a device functional to previce is associated, and in this connection it is 65 vent an idle locomotive, standing say at a to be understood that suchother parts are round-house or on a side track with steam up structurally the samefand operate the "same and air on to start of itself in the event that asfdisclosed in such prior application. I will the locomotive has a leaky throttle yand some also herein use `thesamereference numerals. individual such as an engineer, hostler or as usedin such prior application to indicate '70" machinst happens to cut oil the air pressure. those parts which are 'common to both appli,`

A more general object isto provide, in comcations. f f f bination with a steam valve normally held The locomotive 1 presents the boiler shell open against working steam pressure byy a re- 2, a smoke stack 3, a smoke box 4, a steam chest acting air pressure, means for positively locl- 5 containing the valve 6 anda dry steam pipe 75 ing the valve open yshould the air pressure 7 having the upper end connected tothe usual drop, said locking `means being designed also super-heater8 and the forward endconnected tor unlock the valve upon the air pressure subwith the steam chest containing` the `engine sequently building up. y valves. Y i f e Other objects and advantages of the inven- A steam pipe 2OX communicates through a 80 tion as well as the characteristic features of suitable 'steam supply valve (not shown) the disclosed embodiment will be more'preadwith the vdome of the boiler and connects fory ily understood yfrom the following detailed wardly with a T elbow 2O,2 and theelbow is I" i description taken connection ,with the acconnected by means of a short pipe 20 with companying drawings, in which, ka steam controlling valve 20. The steam con- 85 Figure lis aside view'of the frontend of a trolling valve'is connectedby a steam pipe 22 locomotive equipped with ymy invention.y to the stand pipe 7, `an intercepting valve "21 Figure 2 is an enlarged detailedvertical' being introduced in the said pipe.y In the sectional view taken'centrally through'the pipe 22 I introduce a T elbow 22which is safety attachment. f connected by means of a steam pipe 23 to a oo Figure 3 isa vertical sectional view taken double check valve 23. A steam pipe 282 conalong the line 3 3 of Figure 2 and, f 'nects the double check valve with the steam Figure i is a vertical sectional viewtaken chest y5 and a steam' pipe 23 connects the T along the line 4 4 of -Figure 2. elbow with the double 'check valve. A gov- In the drawings like characters of refererning cylinder 24 is mounted adjacent the o5 ence indicate corresponding parts in the sev.- valve 20, they cylinder controlling the operaeral iigures. l f f tion of the valvef20.,y An air cut off valve 26 The present safety device has been particuisk introduced in anl airpipe 27 which 'comy larly designed for use in connection with the municates With an yair controlling valve (not locomotive drifting attachment as fully de# shown) and'has the forward endthereof con- 10o scribed in my prior application herein renected to an air cylinder 80. A return air ferred to. In said drifting'attachment itwas `pipe 28 leads from the cylinder 8() yand conpossible for an' idle locomotive standing, say, nects kwith the air controlling valve. ,They at a roundhouse'or on aside track with the valve 21 presents an interior vertically dis- 'l steam upy and air ony to start of itself proposed dividing valve seat 7 3 which slidably 105 vided such engine orlocomotive had ay leaky receives the guides of the valve`75. The stem throttle and some individual such as an engi- 78 of the valve is slidabl mounted in the side, A, neer, hostler or machinst cutoif the air pres-` of the valvecasing and vias the endl projected sure. f c 'therebeyond They raforesaid, cylinder 80k lis.

' The safety attachment, hereinafter deaxially aligned withy saidy stem and between 11oy n This invention relates to improvements in safety attachments for locomotives and has particular reference` to a safety device for use scribed and forming the substance o fthis application is for the purpose of positively preventing the engine or 'locomotive from starting under such a condition. L

Asthe `various parts of myy drifting atthe cylinder and the casing of valve y2l I' introduce mysafety devicewhiclr formsthey substanceofy the presentinvention' and is for tau.

thepurp'ose of positively locking valve 7 5 vin opening position When the locomotive is standing idle under the conditionspreviously referred to. Y j i A l n Thesafety device Yis Ynew Ade"scribed in de- TheY valve stenrt78 projects slidably through a suitable'stufhng box 9 into a'cylindrical casing 10, the casing lObeing attached as by screw threading to thervalve casing and being provided at the sides 4vvith similar The inspectionA and escape openings y outer end ofthe casingl() is closed by a screw screw ,threaded nipple 13 to 'which the cyliny Y der 8O is connected. A piston le is slidably rplug 11, the inner end of which is provided witha suitablestufiing box 12. The outer end ofy the plug lis Yprovided with an extending mounted inthe cylinder 8O and ispiiovided Witha steinor pushrod 15k; wh ich passes slid- AablyV through the plug llrandthe bushing 12 and enters the interior of the cylinder 10 and is adapted to engage With the adjacent end of the stein 7 8. i v Y. Y Y v v'Here it will be` observed that a clearance space is: reserved 'between the ,bushings7 that i 1 the stem 15:y is axially aligned with the stein .78 and that the-diameter of the stein 78 is considerably greater than the diameter of the stein 15. lfiithinthis clearance space Iloca-te* a locking plunger 16 Which has the lowerend thereof'slidably received Within a boss ,17 yini rtegrally cast with the cylinderlO. AThe louer end of the plunger yterminates in a guide rodV 16 which passesvslidably through al screw plug 18screW threaded into the louer end` of a cylindrical shell 18 'carried by the lower end of thebos's 17. A lock nut 18X is .placed on the vpluglS and a vspring '19;f`surrounds the rod andhasA one end bearing against the inner endiofthe plug 181 and the other end vcontacting yWith Va Washer .19 engagedtvith theshoulder of the plunger.V The tension in the's rinffcan be O'auoed b ad'ustin@ the l o l n n a` plug 18 yand afterwards tightening up the lock nut, and the spring operates normally to hold the plungerin its uppermost position, that isiviththelower side of the lock- `-ing'opening 16 of the `plunger contacting with the underside ofthestein 15, The loclring opening 16'/V passes .transversely tlrirou'ghV the plunger-and` iscircular and ofslightly ,larger diameter .the stein 7 8; f

thany they projecting end/of By observing 'Figure 2l it be deseen; that the stein 15 is ivithinthe opening 16V andconi .tactingwi'ththe end of the sjtein y7S and is preventing the plunger; .16s-frein rising i .further, and that-the end of the stern 7 8 is envgagi'ngWith-the kside of the plunger and inV such position positively prevents ythe valve 75 from closing. It will also be Vobserved that should the plunger be forced down, the

Y 1opening 16 Willbe 'brought into registration with the end of the stems-78 and yaccordingly at this time should the pressuresagainst the valve 75 be greater than the pressure in the cylinder 8O the yvalve will seat asthe end of the stein 78 can then pass into they opening 16', The uppei' end of the plunger is received Within asle'ev'e like extension 29 of a would be actually connected to the main air n reserVI (not shown)r of the locomotive. l li/ith vinyl drifting attachment 1 including the safety device 4of the present invention installed on a locomotive it islimpossible for suchdocomotive;'Vivhen standing idle with steanrup and air in the pipes 34 and27 u to start, Yby reason of a leakyfthrottle, inthe event thatsoineone V should release the air pressure inthe pipesgand 27. A Under such Y a condition fthe plunger acting under the inuence of the spring will lock the stein 78 and l i consequently the valve 7 5 open. In this connection I might explain .that'the steam leal;- ing past l the throttle passes upwardly through the pipeQQto Ythe valv-e75 and the l isaidvalvebe locked positively openas above explained and under the conditions outlined such leaking steam cannoty build up vin the stand pipe 7 as it is free vto escape through the'pipe-Zr, valve 23 and pipe 23?, to the cxhaustmpassages the engine( n n yUnderthe Working conditions of the engine there is air under'pressure direct frein the reservoir in the cylinder 31 andairpressure iintlie cylinder@controlled by the cut ofie valve 26 and ythe pressureof the air 'inthe cylinder 31 holdsthe plungeridoivn. against y the pressure ofthe spring and tviththe' opening 16 thereof. directly ,opposing ,thel end ofthe stern 7 @with the resiultthat thevalve 7 5 can close at anytime the air Ypressure in the cylinder 8O is cuto.4 Accordingly' the 'valve 7 5 is free to function iii the saine Inanner as described in ,.myprior application, opening` and/closing under the varying "pressure conditions .ofthe steamA in the` pipe/22,V and theY air'in thevcylinder 80. o

The safety attachinenthowev.er, will act.

to loclr the valve? 5 positively open vunder the conditions hereinbeforelinentioned for the Areason that should an engineer, fht'istler kmechanic orothery person cut off the lkair such would reduce the air pressure in the cylinder y311.10 atmosphere and would accordingly permit the plunger toniove up quickly underfthe (action ofv the spring and lock the valve stein 7 8 in the manner shownk in the rdrawings which is the open position of the plunger, a piston associated with ther valve 75. The said valve being locked open plunger, a cylinder slidably receiving the` steam cannot build up in the stand pipe 7 with the result that the engine Will remain standing still. The instant, however, that air pressure is available at the cylinder 31 the safety device is thrown out of commission as the plunger is dropped to permit the valve stem to pass into the opening 16 with the result that the said valve is then free to function entirely independent of the locking device.

Vhat I claim asmy invention is:

l. The combination with a steam controlling valve, the said valve being provided With an extending stem and a pressure operated piston having an extending stem engaging With the former stem and maintaining the valve open, of a spring pressed locking plunger to travel across the path of the valve stem and a pressure operated piston associated With the plunger and'holding the plunger clear of the valve stem during the period that there is pressure against both pistons and freeing the plunger to travel across the path of the valve stem under the pressure of the spring and lock the same against movement upon a reduction of the pressure occurring simultaneously in the cylinders.

2. The combination With a valve casing and a steam controlling valve mounted Within the casing and provided with an extending stem, of a compressed air receiving cylinder adjoining the casing, a piston mounted Within the air cylinder and provided With an eX- tending stem axially aligned with the valve stem to contact with the valve stem and hold the valve open under pressure of air Within the cylinder, a spring pressed locking piston and connected With a source of compressed air supply, the pressure of the air inside the latter cylinder ymaintaining the plunger free of the valve stem yand said plunger upon the reduction of the air pressure in the cylinder travelling across the path of the valve stem and locking the same against movement with the valve open.

3. The combination With a valve casing and a steam controlling valve 'Within the casing, said valve rbeing supplied With an extending stem, of an air cylinder in communication With a source of compressed air supply,a piston Within the cylinder and provided vvith anextending stem of less diameter than the valve stem and engageable there-k with to hold the valve open under the pres# sure of the air Within the cylinder, a locking rplunger' located at the end of the valve stem and provided with an opening receiving the n piston stem, said opening being large enough to permit of a piston associated with oney end ot the plunger, a cylinder receiving the piston and in communication with ay source of com-k pressed air supply, said piston'under the pressure of the airfvvithin said latter cylinder holding the plunger With the opening therein axially aligned with thevalve stem and a spring associated With the plunger for shifting the same into the path of the valve stem to hold the valve open, said spring operating upon the pressure of the air inthe cylinders being simultaneously reduced.vv

Signed at Winnipeg, this 25th day of September 1923. y

PETER Baunnuiivy KAMEDisH. c

the passage of the valve stem, 

